Inroute automatic gain control detection of outroute interference

摘要

A method and a satellite gateway for minimizing an impact of a noise floor variation in a spot beam satellite system. A demodulator processes digitized signals from multiple channels. Digitized signals are automatically gain controlled by respective automatic gain control components associated with respective channels. Automatic gain controlled digitized signals are downconverted and provided to a burst processor. The burst processor processes each downconverted signal and provides, with respect to each downconverted signal, an automatic gain control estimate, a code rate, and an inroute number to a processor component. The processor component determines an average automatic gain control value for each inroute, provides automatic gain control references to the respective automatic gain control components, and periodically sends noise map information to satellite terminals served by the satellite gateway. In some embodiments, the automatic gain control values are biased according to corresponding code rates.

主权项

1. A machine-implemented method of minimizing an impact of a noise floor variation in a Ka band spot beam satellite system, the machine-implemented method comprising:
receiving, by a channelizer of a demodulator included in a satellite gateway, digitized signals for a plurality of channels; for each of the received digitized signals:
performing automatic gain control on a respective digitized signal to produce a respective automatic gain controlled digitized signal, the automatic gain control for the signal being performed by an automatic gain control component of a plurality of automatic gain control components, the automatic gain control component being associated with a respective channel that is associated with the respective digitized signal;downconverting the respective automatic gain controlled digitized signal to produce a respective downconverted signal;providing the respective downconverted signal to a burst processor component of the demodulator, the burst processor component performing:
determining an automatic gain control estimate for the respective downconverted signal,providing the automatic gain control estimate to a processor component of the satellite gateway,performing a second automatic gain control to the respective downconverted signal, based on the automatic gain control estimate, to produce a respective automatic gain controlled downconverted signal,recovering respective demodulated data and burst information from the respective automatic gain controlled downconverted signal, the burst information including channel information, andproviding the respective demodulated data and the burst information to the processor component; maintaining, by the processor component, a plurality of automatic gain control references for the plurality of channels based on automatic gain control estimates associated with the plurality of channels, the maintaining further comprising:
obtaining a code rate from the burst information associated with a corresponding automatic gain control estimate, andcalculating an automatic gain control value based on the corresponding automatic gain control estimate and a fixed non-zero bias value, associated with the obtained code rate, in order to maximize a dynamic range of the respective channel; and providing each of the plurality of automatic gain control references to respective corresponding automatic gain control components of the plurality of automatic gain control components to affect the automatic gain control performed by the respective corresponding automatic gain control components.